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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf75f61f919a5b265a6af4f9a9e818260bb3cff8b2b7539cfdaa0cbceb7725d8' 
  AND token = 'HQiY7l/jalf2d8bAW5ZwC7MYFwF0I4v1EfYYw+ShQvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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