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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d033a7769410b7ffc359f87985cc9f3a873f25f68d2040f4d98c2bab6d1af5' 
  AND token = 'hIEWOI6HcpX3ZnikxsvXfghoXvMR1GD2bSF/O70Vu9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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