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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '424119ba042e686a42817c346140468dff9479df3601fb7c4e7363b326c635fa' 
  AND token = 'M20+YxJWtV2HQgSUX+0IUfzJ48yipud9gcGj6fM515A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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