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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0972ad80a1569ed90e00e07e05fb561fc080bf7b71c31b1e63e3d9574212b29b' 
  AND token = 'f9gGlXzYWPOqiAe8tpPJqZqEP3oQhfg72SdArheIvak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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