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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f5ad90512cad67d68a943a6f1480fd4156c3bbad89e80b83b832a17c73f7b0' 
  AND token = 'Qp0h8oe0GAq02GFjj7tbENs/W98NWOFc85ctrRpC5SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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