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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4077c3d8e8130f37c5cb224b16d4687481dcf37f940e5bd508c18a8a15d38a8c' 
  AND token = 'YWaIfMqL4nFF6T4jEvInaxt9G+IHNYSf3Bc/40W9Swk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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