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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da742a193384896bd2a21bc081c40a6a6df7259e03b4860589836c4b2caf92ed' 
  AND token = 'cM2JksWcq9Nujyk+sCBJuqgVOKSe/OjuWM2lcL/5NmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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