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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922aabdbb0514244a9fe866ce88e0cf7a99dda8026dab5e8fcd414045f75c56c' 
  AND token = 'Sud98iQNzJPW7267Wth52oggLImiH8N0gUx+dMZ7tlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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