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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031ad0dda19bd9bffe77398f4ef766a76111e038f5d12e017dd38daea11ca7cd' 
  AND token = 'Hyhk/9qp1vJqVrxAPX5uF1y8lUzedlW7HO2rtL2IP9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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