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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634b492af42e17308f78b24a36182b9278148597f7fc8fb025774bec2da61663' 
  AND token = 'QkvIAFL7r2CUWUDJrgtwejgzhInxH2R7TBuJBWAaUT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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