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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d832f72b13122ad4622dbec5b5dfcbef50820ffaf1bcd54b0d711b5bd2659c1' 
  AND token = 'QrEXWqf54XhidE02zj8Sf8oolU23mhaoGNnncgi9rbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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