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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4200fa24f04c722607bfcb372d19e19632d68b8748dff595714170026b523596' 
  AND token = '/4/6QQDgInVO7P671bU1jf1jfa+2fxNi+e5sKvM6X7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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