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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914adcdd1d912a3b4a6a72579e51bcaa048422617de23b81412f242c9f74db32' 
  AND token = 'ysp8srevCpU+6EyDk6HE9Y6CH+u9NSNp58JGgZn8VR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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