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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46761c3e3e44768de1930bd9b2b25a810d00c25e8ce96707bdf598a0113be0da' 
  AND token = 'EK8wBkP9fTbLVpcCxW34CQtAxcp8ZzIet6qEhngiI2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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