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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd796379ad0f9a8e26fcaacab0c02793cb5b2850d2548e868cac2945cf7ba57' 
  AND token = 'FImiNSas+eURHHQRFik+YOOP1JzgYMteOSbr6/INdsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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