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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a584ee684e2002a1857351999ade7cec84db6f4c0b477a5aea9b76d002c730f' 
  AND token = 'uWPjqHAw6VwubUq0XwuzIrqoU0ExvBA2KRGlUwK4Lu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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