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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae4d6dfbd084277f6420439d614342af4fde639f4bc65b45200e60062ff1754' 
  AND token = 'tsgPNLTEwoXvHq01ro4WP53PY0RGY26jI8S7AGghllA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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