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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c1b43fcf68bce02ee0fddb2f0f6777f6b46bb495163b500ec39c6c70346842e' 
  AND token = '/nFEzHmW30E89fkekIfroPq6JGdDO9sdpR+YIX8uAMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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