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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f55914920ff5964a464853650eec8d101266ecec253f3b001992d02f7a3223' 
  AND token = 'lqWv5WcaVL2Y6G43t5Vu9Sh2gb0JtZJhFHA3Z+eP/oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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