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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b3f2dca43ed7e6f1d739f98c109c0265488f67eafdc64aaa8a24b86a56741a' 
  AND token = 'uKyg0W4kM7tarsdSmgiTlJfjfc7rOHceZvkhDjbtlMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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