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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52809e26756f9d7bcea0e6ea034241c2adce03356f821845ed2fd66df9f29c9f' 
  AND token = 'ObIuz5EJg/Vr5Ifd9tad+BtNx2BRtv/ACRO14b2yyX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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