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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d51cf47dd3fb6b1fdeb3648e717eb2c14842421ea4e23d0cb680f80d9343e5' 
  AND token = 'PVJYce4IaHRgVqep3EPESVxd98pGNG8KJPDMtKbjRAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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