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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd16e7e305fc146f9d159c5fb4fcdfb678047d1cbfa7d30feb84c1f6d21acaa' 
  AND token = 'IjIqE9zKVD8PSoUby4V52rXZWNeCv1g7O0XpqK+mFWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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