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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0cc51f7501fc6173c3d2324e91a29e5c87f12d8411b690e02f1862f096a8e8' 
  AND token = 'Cgl9jYZr6YufuaSg8UmQtLiqQnap7jLKT6hHSipB7hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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