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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9bd51b1ba53acda6667a8b09adcbdcaacc92846ff1b27afae231f73d04a1aee' 
  AND token = 'ZjxSc8VrpseuT7Z/SrSJVe5dqNux/4SxD8Tud004D7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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