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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e9ed400e1d88f0564071c8cd8ac1dc60c4430e095be6ea8a6718cfe4617e96' 
  AND token = 'Vdx2Ob3k9wSs2XLcozlvUIBgxdm/KXnFO8jGdcsQBzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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