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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922df5951ba31824a09b11dbadff3bb4e9b482ff018f8c9cce30bd659919923f' 
  AND token = 'gvXT57G1HQxVOeT3Is4OKH11yarGgTCzsiaBrSpzzTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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