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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80b8a75f6475818f1bb8da4a7aecbe7371152991590ea28466a363ee4850b45c' 
  AND token = 'sewwgjeQGBKFb3qq6G9s6FI8J7soolJZ6NaTyRz4iLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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