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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db026a2e969c5b1ea812998ae61eef300efad8d178364daea49b7a5d7b36868c' 
  AND token = '6SweiitsvjKNoh7w4KiJ+4+JxhLftUmx3DDg0fz9L4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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