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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842518089904c863e5a30017a3d14d8aeaf723d619993c5489ed074c5299bfe6' 
  AND token = 'cK0xsivI/UBBTVz73cDuT8qCiCSnJXB1fOH+nbRenGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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