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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c74c6bd70c236f443d972f7704f8d7289194fcc7593332480ef50ea0afa1e4' 
  AND token = 'mv/1mUr4HKytAbwijTpg6hfG8dXRv3VxjTsSa10jfXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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