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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3128c888d58cdf2b235495c51224de4f43cad53219b49635ddd2d7bfca7d0e09' 
  AND token = 'scT4uGobjUhP0QO6nK3SjJfvFn2+RjTscWJvYb66nGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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