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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bca7596c9b7b7e683ecba684b0e5a4409543e602037989f64ea886a4e076260' 
  AND token = '6nKzGrxPGh5XdPXU6rQlXi86n3JVjK9JNg+lFM93s64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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