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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdda0a4f2d206931b5ead34dfc88d4a3f2caf3a79432925e68b361da99b5cd7e' 
  AND token = 'PRydnsRbtJtx1waREy3/ZXw8S1911S4uMODWbNsHjiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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