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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a822fadd8a6c177eac7073a1099ebcee8b93ae27a1502c45045ddbfa690214' 
  AND token = 'dtx07uPokEEn7rtx41t0jdkiCyWqOe7srJDH6/uSDGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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