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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a9a574fb7a459ae7690f0cf67483bc20d3ca591807af14d9f46346717eeedc' 
  AND token = 'SCJUC7ZOjxZWCj2irXyFacQVmkh7XKPp/Q29VU/MCRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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