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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa043dbe2edb2c14bf6d18677a85e451ee22b21e75e2d0106c705a2bbec01bc7' 
  AND token = 'ySxHWBalLdb+m0rBWpEe0GlBFrMZZlU/ErTDj3fvSBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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