SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86b43977559c4a6c4a379853a54e218918a4d848d9681398001a2d887c9fb14' 
  AND token = 'hn2KpnVM8El0gjRKlwz0OQ2Ke6RZPe9AGLUlBFuZb0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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