Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b392a023f6b4143de16f66b5671bd31d05dfc2cfd7af16c79c8456f0e93891f8' 
  AND token = 'm2rzizlvnSXdBZIqxdHnSNaV4MyHDHCqiE3+JA3ipO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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