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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '100eec25f4faa3166e803348927ef663f815e019c953158a11d6af931167c71b' 
  AND token = '7kemoHAZ0OG67y2nwO0yRnZtOHfxf587dI5WgnoiV7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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