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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fca3498b0a8ac155121b7af0ada85893a23e018d68a510c647aa3765582e1da' 
  AND token = 'KCipicHai3tJ71KynNTcQBwxI2qmEjDH0HCqL51BCXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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