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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cef7605bbc148fad399770c752ace7b17eedbe2d2699a5a8c777480cdacf0a5c' 
  AND token = 'i31zmixtJfZ61I9MxZs79g5dH1hw7EjhyuD3rVwfF3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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