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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bb948b7e5469aac3053398a79824640080f9c65682762e357b3fdb17d6759a' 
  AND token = 'k02aIG1/gxp4kd5fvudsbYxcxZBbvzOEhQ4QrDBzCl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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