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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a868e24f2e0792606917d7c5961d3fde027c697933f7e5a3c8dca2de6647e92' 
  AND token = 'a3REqz23Jiewp7+Lqdp4NSPcgibEJtUJo2Eu20HpE40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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