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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4367c9155fd4dad4c3eab6768f96c945f1287c4b4d59ed8e100e8be798a46b2' 
  AND token = 'gCJaW73BVhUCOJX5UfRzcu4f6Ca/Frg9nxZNv9ITI6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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