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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55786dd14612b04063317449492f2417072b4253b28a6e4033e3627874cc26d6' 
  AND token = 'B6eDR43m4AYZFnL9sE1Kv4mNJHpmT0VOC6dxxqjCAXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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