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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9413e80abc87657f3f037d7bedc4a35f7a4e32635deefb225102b4197e256933' 
  AND token = 'zBr8O5o7tJMidEo2qgNc2AmaiQz43L8Wv83XND6fUqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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