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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4f416af935318e93ef3442f97a2a06c95a93d400c6e8651c7750fa957f01a1' 
  AND token = 'nEPp+vAtVVTWc4LrbSv7Uv+l9qghQewYNtlWkk+/3jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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