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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7ea04f6044b5d1ddb0a13708a79b16c7ea051f3e383fb6b66fafcd631f309e' 
  AND token = 'Sjz7uw1eSVZA6lbTf4uM1cpl2LXUvjJ5GA15ggiU59c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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