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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a6b96ba3d574c3e9e79b57b543983ab9c84d6dc6ab130c192e254180f589ab' 
  AND token = '+sJgjcDEWOTvRigRuC99OjEoLWvYjpzJAA+E6bKjCYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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