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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e4569c111c7b1deb62d1effb160714883c51ef27d14617871cb0bdf9cb9863' 
  AND token = 'F5MvnuPj4C2rz4gEWAFEGlAm5ja2PEI6VLBYQW1JrCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}