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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbfc5b443c5a5a4c41b36c2e4a65f5ec592118a690ea686027468709615c930c' 
  AND token = 'I2LBZtFrs6ufgfcTrd0KLwXuD9Kbby4Z2LJ42wmGO7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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