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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9125dbe87cdaa0e6c1884a772215035e0f4d6390628754bfd11faa36b547d6da' 
  AND token = 'DJGhSk7ffbGIZkyU/u6tZjW5cpERUkhO66YtOw88n+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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