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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24205ff0391361ca93581afe812e9ca45f03e282699f3bc5e2fba604200fe95e' 
  AND token = 'qDgZwla4nWYDkMDuGF5RV1RZYwmTM7F24dcrc88LiDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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