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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57081c11a316ccaf22a56c324ea81024df7e9d41fb03254ca7ee11ad0b1bf2a8' 
  AND token = 'zPzSxLVKo5K9z+8GNJimfvp6dS1aTzHtcia8EjRIgAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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