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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bac9d3015d54c0e7d09cb6e534d543f942a3a9922f1a2ba68b41bcadf936b62' 
  AND token = '/jFCUZMX5T9bYBdtmfXqOeThiBudSz73rqY44dgcyKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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