SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df6f5953ac1c9d8da584f97ce413d58cf6f3654b68a2fd2d1c6d72cfb737a7d' 
  AND token = 'VEdf57jDvM6kHUnWLYCy/S0m0ztRPkbl5mnRca34t4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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