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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd516bec8ebc550bad5e42ff9880b8977515454b1d0c513db61d2c1785b8af5d' 
  AND token = 'RsCqE3DY/syXclW7Xhvc84qfiJXyrZJvlvtiC5H9Qpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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