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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2adea229d150d3754ec12d1792887892127f7170eee6dee20d5f8f218fd3c4' 
  AND token = 'ocBG/F2WuwbS6zq/DLbqu9iMgOLQr5MnXUVCcmFwlYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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