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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e8e9ffbd06ab48fc57a802d92ae9d4f606b19a4349c9ff72818afdff257cf8' 
  AND token = '2Y/ksSFVO3X84O8IWdwvjabdqXTbmhVxt8qdpwlecwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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