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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a87d6449da6830d4e6956bd7bd25eefa629bf0f7ba5f7fb2b3bf6a11181efc' 
  AND token = 'bn1JjIq16XBUmu4yZgQzcMi/akcE3QGMrqt2wrNHc3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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