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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c501d32d867a3056e6645758e6784617469e082b9614dcfa6e3ca8388ae5a5' 
  AND token = 's25bYGJLuk+8pe/3AP7RD0ijKQEXKxt81vlj0QjNdpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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