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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eaf0c8dd951f2317824a2f6a1120b80527f518c652cdcbda15ca9233e9e1bd3' 
  AND token = 'KBzdYBGzkR8qmMd/dwlHSLstupTB7JsS42zrZ8TOKSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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