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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2835be05b7904b9042492c1f571673b70fb051432c74d852e6d2785b3e6b67c4' 
  AND token = '3psMOQPLmk75levKrFuw6isKOeYJJBk4/anFlRr1j34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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