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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7d616b9f422bbb0f5e9c5319877283cdf3f8accf95bba05bfe9c5be2b24b61' 
  AND token = 'X0mCHt5ZIyqmxjn9Dio3320eD4j+vsKkt9hWaQ1NFXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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